微细矿粒在水溶液中的疏水絮凝

HYDROPHOBIC FLOCCULATION OF FINE MINERAL PARTICLES IN AQUEOUS SOLUTION

本文着重讨论细微矿物颗粒的疏水絮凝行为及机理。对石英、菱锰矿、赤铁矿及金红石的实验研究表明,矿物润湿性的变化对矿粒悬浮液的分散稳定性有巨大影响。矿粒表面疏水化常与显著的絮凝现象伴生,这种絮凝现象无法用经典的DLVO理论解释。通过对石英-胺及菱锰矿-油酸体系疏水絮凝的理论探讨及势能计算,可以看出表面活性剂吸附而诱发的粒间疏水作用势能远远大干双电层作用或范德华作用势能,因此,疏水作用对此种絮凝行为具有支配地位。

In this paper the flocculatuion behavior of fine mineral particles rendered hydrophobic by the surfactant and the mechanism of hydrophobic flocculation are discussed. Experimental studies with quartz,rhodocfirosite,hematite and rutile show that changes in wettability of mineral surface affects seriously the stability of fine particle suspensions. The hydrophobization of particle surface is often accompanied by a distinct flocculation which can by no means be interpreted by DLVO theory. The theoretical approach to hydrophobic flocculation and calculation related to the quartz-amine system as well as to the rhodochrosite-oleate system show that the potential energy of hydrophobic interaction between mineral particles rendered hydrophobic by surfactant far exceeds what resulted from double layer or van der Waals interaction. Flocculation induced by hydrophobic interaction between fine mineral particles plays a predominant role in many techniques of fine particle separation,such as shear flocculation,emulsion flotation.carrier flotation,spherical agglomeration etc.